Let warm, stale air out and fresh, clean air in. The Dometic Fan-Tastic Roof Vent Model 3350 exchanges air quickly, quietly, and efficiently with fixed speed, manual speed, or automatic variable speed to get the airflow precisely as you want. Its simple reverse switch changes the fan direction, drawing air in or out of your RV. This ventilation solution has a built-in thermostat that allows you to adjust the temperature setting. Simply set the desired temperature on the remote control, and the fan motor will start and stop automatically as the interior temperature of the vehicle exceeds or drops below the set temperature. A rain sensor will automatically close the dome when it starts to rain, keeping you and the interior of your vehicle dry.• Fits standard 14" x 14" roof openings• Automatic lift dome seals tight when not in use• Built-in thermostat maintains your desired comfort level• Manual operation in case of power loss• Three fan speeds (low, medium, high)• Quiet operation• Low amp drawSpecsDimensions: 16.5"D x 9.5"H x 16.5"WColor: WhiteThermostat Control: AnalogSpeed Control: 3-SpeedBase Type: High-Profile WhiteDome Style: Smoke Dome Three fan blade speeds (low, medium, high) Reverse switch changes the fan direction Automatic lift dome seals tight when not in use | Dometic Fan-Tastic Roof Vent with Fan, Thermostat, and Powered Lift